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This kit includes 3 Genuine UDI RC 3.7V 500mAh Rechargeable Li-Po Batteries for use with the UDI U45W and U45 2.4GHz 4 RC Quadcopter Drones. Keeping extra batteries on hand will give you extra flight time and increase performance due to its higher current output and power. DO NOT attempt to use these batteries with any models other than the UDI U45W Blue Jay and U45 Raven or models from other sellers as we cannot guarantee compatibility. DO NOT attempt to recharge batteries that are fully drained, have come into contact with water or have become damaged upon collision as this can result in overheating.